straining force

The sphincter must then do all the work of maintaining continence, and the extra pressure of sneezing, coughing, or straining forces urine past the outlet.

His straining force field pushed out a dangerous bruised-purple nimbus as another of Aaron's distorter pulses pummelled him, trying to shove him clean through the wall.

Curiosity, deep stirrings to wander, the still more ancient inheritance of the hunter, a recurrent distaste for labour, and resentment against the necessary subjugations of family life have always been a straining force within the agricultural community.

The rose-glow in which we stood was cut off by the blackness as though it had substance; it shimmered out to meet it, and was checked as though by a blow; indeed, so strong was the suggestion of sinister, straining force within the rayless opacity that I shrank back, and Marakinoff with me.